In quantum field theory, elemental particles are assumed to be point particles. As a result, the loop integrals are divergent in many cases. Regularization and renormalization are necessary to get the physical finite results from the infinite, divergent loop integrations. We propose new quantization conditions for nonpoint particles. With this solid quantization, divergence could be treated systematically. This method is useful for effective field theory, which is on hadron degrees of freedom. The elemental particles could also be nonpoint ones. They can be studied in this approach as well.