In optical burst switching networks, wavelength converters (WCs) of core nodes are used to decrease the burst loss rate. the implementation of the WCs is difficult in the current technology and the cost of WCs high. so some core nodes may be configured insufficient WCs to reduce the cost in OBS networks. however, many data channel scheduling algorithms do not count the number of WCs and the performance of burst loss rate is not good in the condition of insufficient of WCs. to overcome the defect, two novel batch scheduling algorithm improves the WCs' resource utilization probability to reduce the burst loss performance. the later bursts to use improve the brustperformance. the later algorthm can reduce more burts loss rate with the same number of WCs, compared with the other scheduling alogirthms. the simulation results show that the later algorithm is more effective in reducing the burst loss rate with insufficient WCs.