A statistical analysis of particles shows that particles have an overall and regular relationship. All particles occupy a due amount of space-time according to their attributes. Particles with similar attributes form families. The stability of particles in the same family decreases with their increase in mass (energy). Between families, periodic changes of stability and instability are shown. This paper is based on the classification of many particles. All particles are included in the particleperiodic table (PPT) established herein. The PPT sums up the regularity of particle contact and predicted (supposed) new particles.