A novel KTP electro optic deflector with diameter D=4 mm, length L=40 mm, is designed. Compared with the same size LiNbO 3 deflector, the temporal resolution of KTP deflector is 180 ps, while LiNbO 3 deflector is 414 ps. The shaped laser pulse with the least width of 400 ps of KTP deflector and 830 ps for LiNbO 3 can be obtained respectively. Factors affect the property of electro optic defector are analyzed. Using a temperature controlled oven, the wave front distortion in laser pulse propagation can be eliminated.