In order to optimize the trapping potential well of the lattice, an integrated three-dimensional(3-D) optical lattice system with cavity enhancement effect is proposed. Based on the theory of laser-atom interaction, the potential well for loading alkaline-earth metal 88Sr atoms is studied. The effects of confinement ability on cold atoms is obtained by discussing the Lamb-Dicke parameter η. When η＜＜1, atoms are confined tightly in the well and the Rabi radiations associated with the carrier transition have maximum values. The sideband transition is suppressed. Three pairs of lasers are placed orthogonally to each other to form a three-dimensional optical lattice by making an incident laser propagate among mirrors set at several special angles. Results show that the input laser power required by this 3-D optical lattice system is only 1/15 of the power of the traditional system and the maximum depth of the potential well is 86 μK. The trapping frequency along the axis of the lattice is about 158 kHz and the corresponding parameter is only 017. It is also shown that the polarization characteristics of the lattice laser have a significant influence on the stability of the potential well distribution. This negative influence of instability induced by interference can be eliminated by perpendicular polarization between beams in each dimension. The integrated three-dimensional optical lattice can reduce the interference to the atom itself and is conducive to the precise detection of the trapped atom. This study provides a theoretical reference for efficiently loading cold Strontium atoms and other alkaline earth metal atoms into the optical lattice in experiments.