The coordinated efficiency of fuze and warhead can be improved by integrated design of fuze and seeker. Based on converted measurement adaptive Kalman filtering algorithm with debasing, integrated fuze makes warhead dispersion-oriented come true by regarding the difference between the angle of antenna beam and dispersion directional angle of center fragment as controlled variable of fuze action. In this algorithm, the measured value of seeker initially set in polar coordinate system is converted to that reset in rectangle coordinate system and debased. The initial estimation of filtering is established by the first and second measurement. The results of simulation indicate variables can be estimated very well and the coordinated efficiency of fuze and warhead is improved.