A singly resonant KTP-optical parametric oscillator (OPO) pumped by a pulse tunable Ti:sapphire laser is experimentally demonstrated and analyzed. Using one KTP crystal (θ=62.5°, φ=0°), the continuous output wavelength from 1261 nm to 2532 nm of type Ⅱ(A) OPO is obtained by tuning the pump laser from 700 nm to 980 nm, with the maximum output energy of 27.2 mJ and the maximum conversion efficiency of 35.7%.