We demonstrate the ultra-stable frequency sources aiming to improve the short-time instability of primary frequency standards. These sources are realized by using photonic generation approach, and composed of ultra-stable lasers, optical- frequency-combs, optical signal detecting parts, and synthesizers. Preliminary evaluation shows that the sources produce fixed-frequency at 9.54（/9.63） GHz, 10 MHz, and tunable-frequency around 9.192 GHz with relative frequency instability of 10^-15 for short terms.