To date, egg embryonic heart rate in birds has been poorly understood in China. During the breeding season from May to August in 2014, egg embryonic heart rate of Barn Swallow (Hirundo rustica) and Red-rumped Swallow (Cecropis daurica) in Zhalong National Nature Reserve, Heilongjiang, Northeastern China, were measured using the Buddy Digital Egg Monitor. The results showed that egg embryonic heart rate of both swallows increase with incubation days in general. Embryonic heart rate of the Barn Swallow was significantly lower than that of the Red-rumped Swallow in Day 8 (t=-2.602, P=2.602) and Day 11 to14 (Day 11: t = -2.801, P=0.01; Day 12: t=-2.739, P=0.015; Day 13: t=-4.315, P=0.001; Day 14: t= -6.247, P=0.000). However, there was no difference on daily growth of embronic heart rate between Barn Swallow and Red-rumped Swallow (Barn Swallow: 19.03±3.1 BPM, Red-rumped Swallow: 16.1± 3.4 BPM, t=-2.029, P=0.053). In addition, there was also no correlation between daily growth of embryonic heart rate and egg volume, or egg mass in both species ( Barn Swallow, egg volume: 1.73± 0.09 cm₃, r=0.192, P=0.511; egg mass: 1.74± 0.09 g, r=0.128, P=0.663; Red-rumped Swallow, egg volume: 1.74±0.08 cm₃, r= 0.04, P=0.891; egg mass: 1.51± 0.09 g, r=0.054, P=0.855).