A time-of-flight distance measuring system , comprising: a delay unit , receiving a plurality of delay signals (ds 1 ~ds n ) and configured to generate a plurality of delayed pulses (dp 1 ~dp n ) according to the plurality of delay signals(ds 1 ~ds n ), wherein the plurality of delay signals (ds 1 ~ds n ) correspond to a plurality of delay times(t d,1 ~t d,n ); a light-emitting unit , coupled to the delay unit and configured to generate a plurality of delayed pulsed lights (LD 1 ~LD n ) according to the plurality of delayed pulses(dp 1 ∼dp n ); a photosensitive pixel circuit , configured to receive a plurality of delayed reflected lights (R 1 ~R n ) corresponding to the plurality of delayed pulsed lights (LD 1 ~LD n ) to generate a plurality of pixel signals (p 1 ~p n ) corresponding to the plurality of delay times(t d,1 ~t d,n ), wherein the plurality of delayed reflected lights (R 1 ~R n ) are reflected from a reflector , wherein there is a fixed distance between the reflector and the time-of-flight distance measuring system ; a storage unit , configured to store a correspondence between the plurality of delay times (t d,1 ∼t d,n ) and the plurality of pixel signals(p 1 ~p n ), wherein the correspondence includes a plurality of ratios of the plurality of delay times (t d,1 ∼ t d,n ) to the plurality of pixel signals (p 1 ~p n ) respectively; and a control unit , coupled to the delay unit and configured to generate the plurality of delay signals(ds 1 ~ds n ); wherein the time-of-flight distance measuring system (10 performs a time-of-flight distance measuring according to the correspondence between the plurality of delay times (t d,1 ~t d,n ) and the plurality of pixel signals (p 1 -p n ). a delay unit , receiving a plurality of delay signals (ds 1 ~ds n ) and configured to generate a plurality of delayed pulses (dp 1 ~dp n ) according to the plurality of delay signals(ds 1 ~ds n ), wherein the plurality of delay signals (ds 1 ~ds n ) correspond to a plurality of delay times(t d,1 ~t d,n ); a light-emitting unit , coupled to the delay unit and configured to generate a plurality of delayed pulsed lights (LD 1 ~LD n ) according to the plurality of delayed pulses(dp 1 ∼dp n ); a photosensitive pixel circuit , configured to receive a plurality of delayed reflected lights (R 1 ~R n ) corresponding to the plurality of delayed pulsed lights (LD 1 ~LD n ) to generate a plurality of pixel signals (p 1 ~p n ) corresponding to the plurality of delay times(t d,1 ~t d,n ), wherein the plurality of delayed reflected lights (R 1 ~R n ) are reflected from a reflector , wherein there is a fixed distance between the reflector and the time-of-flight distance measuring system ; a storage unit , configured to store a correspondence between the plurality of delay times (t d,1 ∼t d,n ) and the plurality of pixel signals(p 1 ~p n ), wherein the correspondence includes a plurality of ratios of the plurality of delay times (t d,1 ∼ t d,n ) to the plurality of pixel signals (p 1 ~p n ) respectively; and a control unit , coupled to the delay unit and configured to generate the plurality of delay signals(ds 1 ~ds n ); wherein the time-of-flight distance measuring system (10 performs a time-of-flight distance measuring according to the correspondence between the plurality of delay times (t d,1 ~t d,n ) and the plurality of pixel signals (p 1 -p n ). <EOS>