Sintered fly ash and expanded shale were employed as lightweight fine aggregates into internal curing concrete28 day age freeze thaw resistance and salt scaling resistance of normal concrete and internal curing concrete were investigated at water cement ratios(by mass) of 03 and 04 with and without air entrainment. Experimental results show that at water cement ratio of 04, internal curing concrete with lightweight fine aggregate exhibits inferior freeze thaw resistance and salt scaling resistance than that of normal concrete. The reason is that the initial degree of saturation in the interior of internal curing concrete with lightweight fine aggregate is clearly greater than that of normal concrete. Addition of suitable amount of air entrainment can improve the freeze thaw resistance and salt scaling resistance of internal curing concrete with lightweight fine aggregate. At water cement ratio of 03, internal curing concrete with lightweight fine aggregate demonstrates strong freeze thaw resistance and salt scaling resistance without air entrainment. In the same condition, the higher the tube strength of lightweight fine aggregate, the better the corresponding freeze thaw resistance and salt scaling resistance of internal curing concrete.