A cell analyzer, comprising: an optical detection apparatus having a detection region configured to pass a sample liquid, being a reaction between a blood sample and a reagent sample, in sequence with shrouding by a sheath liquid; a conveying apparatus having a conveying line and a control valve, wherein the conveying apparatus is configured to convey the sample liquid into the optical detection apparatus through the conveying line; the optical detection apparatus operable to collect multiple optical signals generated by each of particles irradiated with light in the sample liquid in the detection region, the optical signals comprising at least two of forward-scattered light, side-scattered light and fluorescence, the particles comprising a first category of particles and a second category of particles; further comprising a data processing apparatus, configured to: for each of the particles, acquire intensities of a first group of optical signals, which comprise at least two optical signals selected from the multiple optical signals, and a pulse width of a second group of optical signals, which comprises at least one optical signal selected from the multiple optical signals; for each of the particles, calculate one or more reinforcement signals related to the particle, each reinforcement signal is based on an intensity of a first optical signal selected from the first group of optical signals and a pulse width of a second optical signal selected from the second group of optical signals, wherein the first optical signal is the same as or different from the second optical signal; and distinguish between the first category of particles and the second category of particles by generating a first scattering diagram for the particles based on one of: - one of the one or more reinforcement signals related to each of the particles and one of the optical signals which is different from the first optical signal related to each of the particles, or - a first and a second reinforcement signal of the one or more reinforcement signals related to each particle. an optical detection apparatus having a detection region configured to pass a sample liquid, being a reaction between a blood sample and a reagent sample, in sequence with shrouding by a sheath liquid; a conveying apparatus having a conveying line and a control valve, wherein the conveying apparatus is configured to convey the sample liquid into the optical detection apparatus through the conveying line; the optical detection apparatus operable to collect multiple optical signals generated by each of particles irradiated with light in the sample liquid in the detection region, the optical signals comprising at least two of forward-scattered light, side-scattered light and fluorescence, the particles comprising a first category of particles and a second category of particles; further comprising a data processing apparatus, configured to: for each of the particles, acquire intensities of a first group of optical signals, which comprise at least two optical signals selected from the multiple optical signals, and a pulse width of a second group of optical signals, which comprises at least one optical signal selected from the multiple optical signals; for each of the particles, calculate one or more reinforcement signals related to the particle, each reinforcement signal is based on an intensity of a first optical signal selected from the first group of optical signals and a pulse width of a second optical signal selected from the second group of optical signals, wherein the first optical signal is the same as or different from the second optical signal; and distinguish between the first category of particles and the second category of particles by generating a first scattering diagram for the particles based on one of: - one of the one or more reinforcement signals related to each of the particles and one of the optical signals which is different from the first optical signal related to each of the particles, or - a first and a second reinforcement signal of the one or more reinforcement signals related to each particle. for each of the particles, acquire intensities of a first group of optical signals, which comprise at least two optical signals selected from the multiple optical signals, and a pulse width of a second group of optical signals, which comprises at least one optical signal selected from the multiple optical signals; for each of the particles, calculate one or more reinforcement signals related to the particle, each reinforcement signal is based on an intensity of a first optical signal selected from the first group of optical signals and a pulse width of a second optical signal selected from the second group of optical signals, wherein the first optical signal is the same as or different from the second optical signal; and distinguish between the first category of particles and the second category of particles by generating a first scattering diagram for the particles based on one of: - one of the one or more reinforcement signals related to each of the particles and one of the optical signals which is different from the first optical signal related to each of the particles, or - a first and a second reinforcement signal of the one or more reinforcement signals related to each particle. - one of the one or more reinforcement signals related to each of the particles and one of the optical signals which is different from the first optical signal related to each of the particles, or - a first and a second reinforcement signal of the one or more reinforcement signals related to each particle.