Covariant partial wave analyses for scattering of two particles with O, 1/ 2 spin, and photoproduction of pious on nucleons are obtained, invariant amplitudes are expressed in terms of relativistic invariant quantities. 对自旋0,1/2的粒子的散射和光致产生过程,作出了协变的分波分析,用四维不变量表出了不变振幅。