TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Conditions: The production process of composite is divided into raw material preparation and dehydration testing, which are different in operating steps. The product raw material preparation involves stirring and mixing, heating, stirring and mixing, slowly stirring and mixing, and slowly stirring and adding. The dehydration testing involves alkalinity testing, low-temperature dehydration baking, and packaging for future use. The operational process corresponding to heat accumulation and shielding involves placing the composite material in a wide-neck glass collector tube, arranging products in tubes in annular or rectangular arrays by a fixing material to obtain products tubed in arrays, regularly placing products tubed in arrays in metal heat storage tank, bed, ball or cover to form a uniform heat storage assembly, placing the assembly in sun or heat accumulation portion with plenty of outdoor sunshine or a temperature rise in daytime to absorb environmental heat, continuously subjecting the unmelted product to heat-accumulation phase change, even by mirror reflection, placing the product after phase-change in an indoor place in need of a temperature rise, and using for heat release when shielded from the outdoor environment. The operational process corresponding to solar constant-temperature bricks involves forming regularly shaped, transparent, and hollow bricks with certain structural strength melt as a heat storage core, inserting the core to form semi-finished products of solar constant-temperature bricks, producing finished products of constant-temperature bricks by proper sealing, and laying the finished products in horizontal or vertical arrays by a polyester adhesive to form a solar constant-temperature roof or a solar constant-temperature outer wall. When the polyester adhesive completely dries, the roof or outer wall is capable of automatically accumulating solar radiation heat and environmental heat. When the room temperature is higher than the phase-change temperature of the product, the solar constant-temperature bricks continue to store heat without phase changes. When the indoor temperature drops and is lower than the phase-change temperature of the product, the product undergoes a phase change. The solar constant-temperature bricks automatically release heat to make the indoor temperature the same as the phase-change temperature of the product within a certain time, thus producing a constant-temperature effect.