Abstract: The inherent law of planetary mass distribution in solar system has been explored by calculating and analyzing.The law can be described as that planetary mass values are not arbitrary,but in term of some specific values,each planet mass is made of one or two basic quality which values correspond the 233 law.The law can be explained by the pre-proposed theory,and it relates to the origin of gravity and quality.Because gravity originates in large-scale movement of micro micelle,gravitational mass is equal to product of the maximum speed of micro micelle and generalized particle radius.In the case of the equal maximum speed,when micro micelles nestes step by step inwardly,the radiuses present 2 or 3 times between the adjacent levels,the 233 law of planetary mass distribution is formed in the case of the half shielding.Planetary mass values estimated by the 233 law are in good agreement with the observations,but exit some slight errors.Because the micro micelle around the planet presents density and pressure which have repulsive force,the weakening gravity leading to the measurement value is slightly less than the estimated values.Venus and Uranus have the larger relative error because of the high density micro micelle around them.It is the reasons of the planets reversely rotating and slow rotation velocity of Venus.Split hypothesis of planet formation has been proposed by analyzing,namely all the planets are all derived from the same parent planet,which can be split into the parent Saturn and the parent Jupiter,and further split to form 4 Saturnian planets and 4 Jovian series parents.