Measurements of pulse and steady photoconductivity were made on colored KBr and KCl in an attempt to investigate various kinds of electron traps in colored alkali halides. To investigate the space charge polarization effect which makes it difficult to measure the true photoconductivity of specimens, photocurrents produced by repeated light pulses under various conditions were observed. The frequency dependence of a.c. photocurrents under steady illumination was also investigated. From the above results, the condition of space charge free was found. The temperature dependence of the pulse photocurrent, the time constants of current-decay, and the a.c. photoconductivity under steady F-light illumination vs. its illumination level were measured under this condition. By applying trapping kinetics to the above results, three kinds of electron traps were found in colored KBr, one corresponding to F-centers and the other two to unknown centers. In KCl traps produced by photo-chemical reaction were found in addition to F-centers.