"There were no signs... Before Gambia's cutting ties (with Taiwan), it is an isolated incident and based on the information from various sources, China did not interfere," Ma told a briefing in Taipei.
Ma was responding to a question on concerns in Taiwan on whether China was involved in the diplomatic setback and whether Gambia's move could trigger a "domino effect" among the island's remaining 22 allies.
Gambian President Yahya Jammeh caught Taiwan unawares last week when he said his government had broken off diplomatic ties after 18 years owing to "strategic national interest".
China, which has growing investments and influence in Africa, swiftly denied it put pressure on Gambia, but said support for "the peaceful reunification of China is an irreversible trend".
Since taking office five years ago on a Beijing-friendly platform, Ma has promoted a diplomatic truce with China, aimed at preventing the former bitter rivals from luring away each other's allies with hefty financial aid packages.
"The viable diplomacy policy is effective and we think we should continue to promote it," Ma said today.
Under Ma's term, Taiwan and China have signed 19 agreements in trade, judicial assistance and tourism but Ma reiterated today that the timing was not right for the two sides to move to political talks or conclude a peace treaty.
Beijing still claims the self-ruled island as part of its territory awaiting reunification, by force if necessary.
