Abstract: Sensor placement is one of the key topics in sensor networks study.Two improved algorithms were finished for the efficient coverage in a sensor field,based on Dhillon s.s.Model method.The new method was aimed at minimizing the number of sensors,which used some algorithms such as to reduce local redundancy,optimize the overall performance,and considers the detection limitation of sensors,modified algorithm initialization model.The ultimate simulation results demonstrate the effectiveness and the excellent performance of the presented model compared with the original placement algorithms.