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Complete solid solutions between Mg2SiO4 and LiMgPO4 are confirmed by the XRD results. The phase constitution of 0.5Mg2SiO4‐0.5LiMgPO4 is found to be dependent on firing temperature. The chemical compatibility between Mg2SiO4 and rutile phase at sintering temperature is modified by incorporating LiMgPO4. The microwave dielectric properties of (1−y)(0.5Mg2SiO4‐0.5LiMgPO4)‐yTiO2 (y = 0–0.3) composite ceramics have been investigated. The optimized microwave dielectric properties for 0.35Mg2SiO4‐0.35LiMgPO4‐0.3TiO2 ceramics sintered at 1050°C show low dielectric constant (11.4), high‐quality factor (31 800 GHz), and low‐temperature coefficient of resonant frequency (−4 ppm/°C).