Based on the calculation of the conservation of angular momentum, it is proved that the angular momentum of the primordial clouds is insufficient. The rotational inertial centrifugal force of nebula is not large enough to resist the contraction in the inner parts of nebula. Thus, the nebular disk can not be formed in the equator of nebula. Meanwhile, the nebular contractive speed in the radial direction is quicker in the inner than that in the outer. As a result, the center of the nebula forms the sun, and the exterior nebular material forms the nebular disk because it fails to catch up with the inward contraction of the nebular material in the inner parts. The fission and drop-out of the nebular disk lead to the formation of the nebular ring, and the nebular ring forms the planet and its satellite. On the basis of our analysis, the principal characteristics of the solar system are interpreted.%通过角动量守恒计算,证明了原始星云角动量不足,单纯靠星云自转惯性离心力无法抗衡中心部位星云的吸引力,无法在星云赤道处形成星云盘.原始星云角动量不足,同时星云收缩时径向方向速度不等,内快外慢,结果中心部位星云形成太阳,外部赤道部位星云物质因赶不上内部星云物质收缩而掉队形成星云盘.再由星云盘分裂、掉队形成星云环；星云环形成行星、卫星.对太阳系一些主要特征,作了分析和说明.
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