To improve the laser performance, an orthogonal polarized He-Ne laser with integrated Y-shaped cavity is designed after modifying the cavity structure, the gain region and the processing technology of polarizing beam splitter. Cavity structures and operating principles of the laser are described, and the mode, power, lock-in features, frequency difference stability of the laser are measured. Detailed performance enhancements are shown, especially the frequency difference stability. Comparisons are presented to traditional laser with detached Y-shaped cavity. The results show that the frequency difference between two cavities can be linearly adjusted by changing the voltage of the piezoelectric transducer in the P-cavity. Compared with the detached Y-shaped cavity laser, the output power of the integrated laser is improved to 647 μW, the lock-in frequency difference is reduced to 12 MHz, the range of frequency difference is improved to 12~1038 MHz, while the frequency difference stability is improved to 1.2×10⁵ Hz.