A method for evaporation monitoring, the method for evaporation monitoring comprises: providing an evaporation mask (100, 300), the evaporation mask (100, 300) comprising a first functional region (110a, 310a) and a first peripheral region (110b, 310b) disposed outside of the first functional region (110a, 310a), the first functional region (110a, 310a) defining at least one first opening (111, 311), the first peripheral region (110b, 310b) defining at least one second opening (112, 312), wherein the second opening (112, 312) is configured to form a monitoring structure (220, 420) on the OLED panel (200, 400) by evaporation; providing an OLED panel (200, 400), the OLED panel (200, 400) comprising a second functional region (200a, 400a) and a second peripheral region (200b, 400b) disposed outside of the second functional region (200a, 400a), the second peripheral region (200b, 400b) having an observation layer (210, 410) formed thereon, wherein the observation layer (210, 410) is configured to facilitate an observation of the monitoring structure (220, 420); forming a functional layer (230, 430) and at least one monitoring structure (220, 420) on the second functional region (200a, 400a) and the observation layer (210, 410) of the OLED panel (200, 400) respectively using the evaporation mask (100, 300); acquiring an actual center of the at least one monitoring structure (220, 420) on the OLED panel (200, 400); and comparing the actual center of the monitoring structure (220, 420) with a theoretical center of the monitoring structure (220, 420) to obtain an evaporation effect of the at least one first opening (111, 311) of the evaporation mask (100, 300), wherein the observation layer (210, 410) is made of a reflective material and has a color different from a color of the monitoring structure (220, 420) to ease a contour of the monitoring structure (220, 420) being captured by an image capturing device, characterized in that the observation layer (210, 410) covers an entirety of the second peripheral region (200b, 400b); and in that the actual center of the at least one monitoring structure (220, 420) is acquired in the following way: capturing the contour of the at least one monitoring structure (220, 420) by a camera or a video; and calculating the center of the at least one monitoring structure (220, 420) according to the captured monitoring structures. providing an evaporation mask (100, 300), the evaporation mask (100, 300) comprising a first functional region (110a, 310a) and a first peripheral region (110b, 310b) disposed outside of the first functional region (110a, 310a), the first functional region (110a, 310a) defining at least one first opening (111, 311), the first peripheral region (110b, 310b) defining at least one second opening (112, 312), wherein the second opening (112, 312) is configured to form a monitoring structure (220, 420) on the OLED panel (200, 400) by evaporation; providing an OLED panel (200, 400), the OLED panel (200, 400) comprising a second functional region (200a, 400a) and a second peripheral region (200b, 400b) disposed outside of the second functional region (200a, 400a), the second peripheral region (200b, 400b) having an observation layer (210, 410) formed thereon, wherein the observation layer (210, 410) is configured to facilitate an observation of the monitoring structure (220, 420); forming a functional layer (230, 430) and at least one monitoring structure (220, 420) on the second functional region (200a, 400a) and the observation layer (210, 410) of the OLED panel (200, 400) respectively using the evaporation mask (100, 300); acquiring an actual center of the at least one monitoring structure (220, 420) on the OLED panel (200, 400); and comparing the actual center of the monitoring structure (220, 420) with a theoretical center of the monitoring structure (220, 420) to obtain an evaporation effect of the at least one first opening (111, 311) of the evaporation mask (100, 300), wherein the observation layer (210, 410) is made of a reflective material and has a color different from a color of the monitoring structure (220, 420) to ease a contour of the monitoring structure (220, 420) being captured by an image capturing device, characterized in that the observation layer (210, 410) covers an entirety of the second peripheral region (200b, 400b); and in that the actual center of the at least one monitoring structure (220, 420) is acquired in the following way: capturing the contour of the at least one monitoring structure (220, 420) by a camera or a video; and calculating the center of the at least one monitoring structure (220, 420) according to the captured monitoring structures. capturing the contour of the at least one monitoring structure (220, 420) by a camera or a video; and calculating the center of the at least one monitoring structure (220, 420) according to the captured monitoring structures.