Funded by National Natural Science Foundation of China (NSFC) general/key projects and Shenzhen Fundamental Research key project, we explore the chip-scale silicon photonics Optical Phased Array (OPA). Based on SOI and SiNx process platform, we succeed in designing and fabricating OPA chips for potential applications in LiDAR, Optical Wireless Communication (OWC), and sensors. Especially, OPA is integrated into OWC transceivers, with fast and self-adaptive Acquisition-Tracking-Pointing (ATP). The integrated OPAs can suppress the OWC link fluctuations in air and water, and beam wandering caused by water-air waves. We are focusing on broadband OPA, sparse phased array, and adaptive on-chip transceiver.