The PLA said it was the largest military parade in the city since the 1997 handover, though it was similar in style and tone to the one given by his predecessor, Hu Jintao, in 2012.
Professor Lau Siu-kai, vice-chairman of the Chinese Association of Hong Kong and Macau Studies, a semi-official think tank, said Xi delivered a tougher message than in speeches by former presidents Hu Jintao and Jiang Zemin.
Recurrent in the images are the themes of nationalism versus colonialism, justice and freedom under Beijing's control, and the color red, a symbol of good fortune and Beijing support.
From 1997 to 2016, Hong Kong's GDP increased from $175.5 billion to $319 billion, according to Luo.
Addressing the dinner held in honor of him Friday, the president called on Hong Kong to leverage its institutional advantage of "one country, two systems" to create new growth drivers and new space for development.
Lam took her oath in Mandarin Chinese and not in the local Cantonese on Saturday amid scattered protests.
"We should have full confidence in ourselves, in Hong Kong and in our country", the president said, calling for persistent and unrelenting efforts to achieve even greater success in the practice of "one country, two systems" in Hong Kong.
There is growing concern that the Chinese central government is undermining Hong Kong's more politically liberal traditions, despite its promise to give it a high degree of autonomy.
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But the march, which saw banners with the slogans "Democracy Delay No More!" In that symbolic place shouted slogans in favor of democracy and the release of Chinese Nobel Peace Prize Liu Xiaobo (terminal cancer patient) before being arrested by the police.
" The "two-country system" is eroding, sometimes subtly, sometimes much more direct, but the fact is that China is not respecting it and will not survive much longer", says Chan Kin-man, Professor Of Sociology and co-founder of the movement Central Occupy, to THE WORLD.
"The people of Hong Kong enjoy more extensive democratic rights and freedoms than at any other time in its history", Xi said during the ceremony.
"We need to show our dissatisfaction with the Chinese government and the government of Hong Kong, and we want them to understand our point of view better", he said.
Alleging that members of the police had manhandled members of Demosisto and another political group, the League of Social Democrats, when taking part in a rally on Saturday morning, Wong decried this treatment as an insult to Hong Kong's enshrined right to peaceful protest.
They were swiftly stopped by police and Chinese-flag-waving counter-protesters, with the action ending about an hour later.
Xi addressed the protests obliquely, saying that in the years since Hong Kong returned to China "We've met some new situations, new issues and new challenges".
The booksellers' case tapped into deep seated fears over how far China is reaching into Hong Kong and curbing freedoms. Under the initiative, Hong Kong can invest in overseas markets and provide services, such as finance, insurance and basic facilities, Lam said.
"In the next five days, I'll be speaking to my team and making sure I do not let the central government or the people of Hong Kong down".